Ouch.  Makes me cringe.  Good luck getting it fixed.  A couple things I notice.  I think this is beyond a weld repair.  Can it be done?  Most likely.  Will it hold, depends on loading.  Will you ever feel comfortable with running it at load?  I would always be worried when I'd hit something with a shank or a mower that would stress the welded area and cause it to break.  I'll also say that this does not look like a great casting to me.  I see some thin wall sections like around the right side middle area.  The way the bolt hole flange cracked and broke is crazy.  And it looks like there was a crack along the lower surface that shows fatigue before fracture.  Amazing what the new cameras can reveal with just a photo.  If the dealer added the hoe for you, I'd certainly lean hard on them for free labor if not entire repair costs. If they didn't add the hoe, I would still try to ask the manufacturer to assist.  However, that could be a long drawn out process.  They are notoriously slow in response to these sorts of things and would likely attempt justify "no fault" due to the hoe.  But worth a shot IMHO.  Sometimes too the dealer will show mercy and make you pay for parts while they "absorb" the labor on a warranty claim.
It seems that the grain size on that casing is fairly large too......out of spec...doubtful.  But for cast steel/iron in todays world, seems fairly granular.  Assuming it's not Aluminum as I see some corrosion.